Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Time scales of melt extraction revealed by distribution of lava composition across a ridge axis

Abstract : Temporal fluctuations of magmatic processes during the last 800 kyr have been investigated for the slow spreading Central Indian Ridge. The fluctuations are recorded by variations in lava chemistry along a 40 km long profile across the ridge. The temporal relations of the basalts were accurately restored using magnetic microanomalies. We report on the occurrence of ancient lavas enriched in incompatible elements whereas on-axis samples are typical normal mid-ocean ridge basalts. The enriched lavas are symmetrically distributed on either side of the ridge, implying that enriched melts reached the seafloor at intervals of about 150–200 kyr. This periodicity is viewed as a characteristic time scale in the aggregation processes of the melts produced from a heterogeneous mantle source. Geochemical variations of zero-age mid-ocean ridge basalts may primarily reflect such periodic processes rather than the spatial distribution of mantle heterogeneities.
Complete list of metadata

Cited literature [37 references]  Display  Hide  Download
Contributor : AdminHAL UnivBrestBU Connect in order to contact the contributor
Submitted on : Tuesday, February 15, 2011 - 10:29:05 AM
Last modification on : Monday, July 4, 2022 - 9:54:49 AM
Long-term archiving on: : Monday, May 16, 2011 - 2:49:21 AM


Publisher files allowed on an open archive



Carole Cordier, Mathieu Benoit, Christophe C Hémond, J. Dyment, Bernard Le Gall, et al.. Time scales of melt extraction revealed by distribution of lava composition across a ridge axis. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2010, 11, pp.Q0AC06. ⟨10.1029/2010GC003074⟩. ⟨insu-00563239⟩



Record views


Files downloads